Since the gamemode isn't wanted here, even just to maintain (and especially now that progression Traitors are being added which will break IAA even more), I'm gonna give my alternate idea to just remove IAA entirely.
This is also to help downstream, as any plan on just 'adding it downstream' is kinda screwed over by it TECHNICALLY still being upstream, and its code conflicting with my own, even if it is just broken and unmaintained.